Bone-on-Bone
A colloquial term describing advanced osteoarthritis where cartilage has worn away completely, allowing direct contact between bone surfaces. Often painful and may require surgery.
Extended Definition
“Bone-on-bone” is a commonly used term to describe end-stage osteoarthritis where the protective cartilage has worn away completely in at least one area of the joint, allowing the underlying bones to contact each other directly.
X-Ray Appearance
On X-ray, bone-on-bone arthritis shows:
- No visible joint space in affected area
- Bone sclerosis (whitening) from increased density
- Osteophytes (bone spurs) at joint margins
- Cysts in the bone
Clinical Implications
Bone-on-bone OA often means:
- More constant, severe pain
- Limited response to conservative treatments
- Higher likelihood of needing joint replacement
- Reduced candidacy for some injection treatments
Can HA Injections Help?
HA injections work best in mild-to-moderate OA. In true bone-on-bone cases, they may provide less benefit since there’s little remaining cartilage to lubricate. However, some patients still experience relief—it depends on individual factors. Your doctor can help determine if you’re a candidate.
Related Terms
More Conditions Terms
View allBilateral Arthritis
Arthritis affecting the same joint on both sides of the body, such as both knees or both hips. Common in osteoarthritis due to similar wear patterns.
Bone Spur
A smooth, bony growth that develops along the edges of bones, especially in joints affected by osteoarthritis. Also called an osteophyte.
Chondromalacia
Softening and deterioration of cartilage, most commonly affecting the underside of the kneecap. Often considered an early stage of patellofemoral arthritis.
Crepitus
A crackling, popping, or grinding sensation or sound that occurs during joint movement, often felt or heard when bones with damaged cartilage rub together.
Degenerative Joint Disease
Another name for osteoarthritis, emphasizing the progressive wear-and-tear nature of the condition. Often abbreviated as DJD.